<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!--警告区域-->
            <el-alert  show-icon title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false">
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                    expand-trigger="hover"
                    :options="catelist"
                    v-model="selectedCateKeys"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handdleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane> 
                <!-- 添加静态参数的面板 -->
                <el-tab-pane label="静态参数" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展示行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handdleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
             //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态参数的数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true,message:'请输入参数名称'}]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name:[{required:true,message:'请输入参数名称'}]
            }
        }
    },
    created(){
        this.getCateList()  
    },
    methods:{
        //获取所有商品分类列表
      async getCateList(){
          const {data:res} =await this.$http.get('categories')
          if(res.meta.status!==200){
              return this.$message.error('获取商品分类失败!')
          }
          this.catelist=res.data
          console.log(this.catelist);
      },
      //级联选择框选中项变化,会触发这个函数
      async handleChange(){
          this.getParamsData()
      },
      //tab 页签
      handleTabClick(){
          console.log(this.activeName);
          this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData(){
        //证明选中的不是三级分类
          if(this.selectedCateKeys.length !==3){
              this.selectedCateKeys=[]
              this.manyTableData=[]
              this.onlyTableData=[]
              return
          }
        // 证明选中的是三级分类
        console.log(this.selectedCateKeys);
        //根据所选分类的Id，和当前所处的面板，获取对应的参数
        const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
        console.log(this.cateId);
        if(res.meta.status!==200){
            return this.$message.error('获取参数列表失败！')
        }
        // console.log(res.data);
        res.data.data.forEach(item=>{
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            //控制文本框的显示与隐藏
            item.inputVisible=false
            //文本框中输入的值
            item.inputValue=''
        })
        console.log(res.data);
        if(this.activeName=="many"){
            // console.log(res.data);
            this.manyTableData=res.data.data
        }else{
            this.onlyTableData=res.data.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed(){
          this.$refs.addFormRef.resetFields()
      },
      //点击按钮，添加参数
      addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
            if(res.meta.status !==201){
                console.log(res);
                return this.$message.error('添加参数失败!')
            }
            this.$message.success('添加参数成功')
            this.addDialogVisible=false
            this.getParamsData()
          })
      },
      //点击按钮,展示修改的对话框
      async showEditDialog(attr_id){
        //   console.log(attr_id);
          //查询当前参数的信息
          const {data:res}=await this.$http.get(`/categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
          if(res.meta.status!==200){
              return this.$message.error('获取参数信息失败！')
          }
        //   console.log(res.data.attr_name);
          this.editForm=res.data
          this.editDialogVisible=true
      },
      //重置修改的表单
      editDialogClosed(){
          this.$refs.editFormRef.resetFields()
      },
      //点击按钮，修改参数信息
      editParams(){
            this.$refs.editFormRef.validate(async valid=>{
            console.log(this.editForm.attr_name);
            console.log(this.attr_name);
            if(!valid)return
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败！')
            }
            this.$message.success('修改参数成功!')
            this.getParamsData()
            this.editDialogVisible=false
          })
      },
      //根据Id删除对应的参数项
      async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err=>err)
        //用户取消删除操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除！')
        }
        //删除的业务逻辑
        const {data:res}= await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      //文本框失去焦点，或按下去 Enter 都会触发
      async handleInputConfirm(row){
        //   console.log('ok');
        if(row.inputValue.trim().length===0){
            row.inputValue=''
            row.inputVisible=false
            return
        }
        //如果没有 return,则证明输入的内容需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        //需要发起请求保存这次操作
        this.saveAttrVals(row)
      },
      //将对 attr_vals的操作，保存到数据库
      async saveAttrVals(row){
          //需要发起请求保存这次操作的回调函数
          const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){  
            return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
      },
      //点击按钮，展示文本框输入框
      showInput(row){
        row.inputVisible=true
        //让文本框自动获取焦点
        //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数可选项
      handdleClose(i,row){
          row.attr_vals.splice(i,1)
          this.saveAttrVals(row)
      }
    },
    computed:{
        //如果按钮需要被禁用，则返回true, 否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        //当前选中的三级分类的Id    
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName=="many"){
                return '动态参数' 
            }else{
                return '静态属性'
            }
        }
    }
}
</script>
<style scoped>
.cat_opt{
    margin: 15px 0;
}
.el_tag{
    margin: 10px;
}
.input-new-tag{
    width:100px
    
}
</style>